Summer is knocking at our door, and while some take comfort in blasting the air conditioning or diving into a cool pool to beat the heat, others take comfort with an icy brew in the company of friends. With summer officially just a few weeks away, get a head start with A Cappella Books and Euclid Avenue Yacht Club as they celebrate Dublin's legendary stout, Guinness, as it turns 250 this year. The GOODNESS OF GUINNESS celebration touts specially priced pints and pitchers of Dublin's finest, special Guinness merchandise, and copies of Tony Corcoran's new book, The Goodness of Guinness: A Loving History of the Brewery, Its People and the City of Dublin. Free. 7 p.m. 1136 Euclid Ave. 404-681-5128. www.acappellabooks.com.